Performance and bug fixes.

Fixed a lot of bugs concerning Temporal Upsampling and DLSS 

Fixed bugs that caused light issues when ESC or M key where pressed to open the game menu

Fixed a bug that didn't save graphics settings when loading

Fixed Temporal Upsampling not working (AMD GPU's were struggling to get high FPS)

Fixed FPS Counter

Added better lights in the first and last map

Better Sky in the first map (and slightly increase in performance)